A plant watering device includes a first body portion, a second body portion having a chamber therein and connected to the bottom of the first body portion, a third body portion set on the top outer wall of the first body portion, and a water supplying tube which is inserted into one side of the third body portion, extending downwards along one side of the first and second body portions to the bottom of the second body portion and upwards along the opposite side of the second and first body portions, and out of the third body portion at the opposite side. Water is provided by the water supplying tube through a hole into the bottom of the chamber and its pressure is regulated using a micropore material block or a water-absorbent rod in the chamber, and a soft water-permeable disc at the bottom of the first body portion.
